Could be the twin-turbo version of your 13B engine meant to energy the 3rd-era RX-7 introduced in late 1991. Each rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the total displacement was 1308cc. Great fit for any Mazda swap or substitute job. My son’s vehicle https://mazda-rotary-engine-sale17202.ssnblog.com/37679979/the-2-minute-rule-for-13b-turbo-2-engine-for-sale